WO2016197312A1 - Procédé et appareil d'encodage d'indice de pixel, et dispositif de traitement d'image - Google Patents

Procédé et appareil d'encodage d'indice de pixel, et dispositif de traitement d'image Download PDF

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Publication number
WO2016197312A1
WO2016197312A1 PCT/CN2015/081032 CN2015081032W WO2016197312A1 WO 2016197312 A1 WO2016197312 A1 WO 2016197312A1 CN 2015081032 W CN2015081032 W CN 2015081032W WO 2016197312 A1 WO2016197312 A1 WO 2016197312A1
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WIPO (PCT)
Prior art keywords
pixel
encoding
index
encoded
bitstream
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Ceased
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PCT/CN2015/081032
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English (en)
Chinese (zh)
Inventor
朱建清
王争
数井君彦
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Fujitsu Ltd
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Fujitsu Ltd
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Priority to PCT/CN2015/081032 priority Critical patent/WO2016197312A1/fr
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Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/157—Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter

Definitions

  • the present invention relates to the field of graphic image technology, and in particular, to a pixel index encoding method, apparatus, and image processing apparatus.
  • Palette-based coding is widely used in graphic image technology (especially video coding technology).
  • a coding unit for the image area to be encoded, for example, a coding unit (CU), including a plurality of pixels having color values (for example, RGB mode, having 24 bits of true color); in order to reduce the storage bits
  • the storage capacity of the image image which can usually point the pixel to the data index of the palette.
  • the color value of each output pixel can be determined by looking up a palette with a corresponding data index.
  • the palette is a set of pixel values. For pixels whose pixel values are in the palette, only the pixel index corresponding to the pixel value in the palette is used. Thereby, only the palette and the index corresponding to the pixels in the coding unit can be bit-stream encoded, and the bit cost of the coding can be reduced.
  • an index copy run can be employed when performing bit stream encoding.
  • the palette copy type identifier (palette_run_type_flag) is COPY_LEFT_MODE, and the pixel value of one pixel is the same as the pixel value of the left pixel, the copy left mode may be used to generate the pixel index, the copy type, and The copy information of the copy value;
  • the palette copy type identifier (palette_run_type_flag) is COPY_ABOVE_MODE, in the case where the pixel value of one pixel is the same as the pixel value of the upper pixel, the copy above mode may be used to generate the copy type. And copy information of the copied value.
  • Embodiments of the present invention provide a method, an apparatus, and an image processing apparatus for encoding a pixel index. Further reduce the bit cost of the encoding.
  • a method for encoding a pixel index includes:
  • the plurality of pixel indices are bitstream encoded; wherein the last pixel index is not bitstream encoded if the last pixel index first appears.
  • an apparatus for encoding a pixel index comprising:
  • a palette determining unit that determines a palette corresponding to an image region to be encoded
  • a pixel index determining unit based on the palette, determining a plurality of pixel indexes that the image region to be encoded needs to be encoded;
  • bitstream encoding unit that performs bitstream encoding on the plurality of pixel indexes; wherein the last pixel index is not bitstream encoded if the last pixel index first appears.
  • an image processing apparatus including:
  • An image encoder that determines a palette corresponding to an image region to be encoded; determines a plurality of pixel indexes that need to be encoded by the image region to be encoded based on the palette; and performs bitstream processing on the plurality of pixel indexes Encoding; wherein the last pixel index is not bitstream encoded if the last pixel index first appears;
  • An image decoder determining a palette of the image area to be decoded and a number of pixel indexes that need to be decoded; determining whether the last pixel index first appears according to the number of the color palette and the pixel index; The last pixel index is obtained based on a known pixel index in the case where the last pixel index first appears; the last pixel index is obtained from the bit stream if the last pixel index is not first present.
  • a computer readable program is provided, wherein when image processing When the program is executed in the device, the program causes the computer to execute the encoding method of the pixel index as described above in the image processing device.
  • a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform an encoding method of a pixel index as described above in an image processing device.
  • An advantageous effect of the embodiment of the present invention is that a plurality of pixel indexes that need to be encoded in the image region to be encoded are bit-stream encoded, wherein the last pixel index is not bit-stream encoded in the case where the last pixel index first appears. Thereby, it is not necessary to encode all the pixel indexes in the copy information, and the bit cost of encoding can be further reduced.
  • FIG. 1 is a schematic diagram of an example of a coding unit according to an embodiment of the present invention.
  • 2 is a schematic diagram of current bitstream coding
  • FIG. 3 is a schematic flowchart of a method for encoding a pixel index according to Embodiment 1 of the present invention
  • FIG. 4 is a schematic diagram of another example of a coding unit according to Embodiment 1 of the present invention.
  • FIG. 5 is a schematic diagram of an encoding apparatus for a pixel index according to Embodiment 2 of the present invention.
  • FIG. 6 is a schematic diagram of a method for decoding a pixel index according to Embodiment 3 of the present invention.
  • FIG. 7 is another schematic diagram of a method for decoding a pixel index according to Embodiment 3 of the present invention.
  • FIG. 8 is a schematic diagram of a pixel index decoding apparatus according to Embodiment 4 of the present invention.
  • Figure 9 is a block diagram showing the configuration of an image processing apparatus according to a fifth embodiment of the present invention.
  • FIG. 1 is a schematic diagram showing an example of a coding unit according to an embodiment of the present invention, showing a case of a coding unit (CU).
  • the coding unit has 8 x 8 pixels; wherein the 8 x 8 pixels have different 7 pixel values (representing different colors).
  • pixels having the same pixel value in FIG. 1 use the same symbol to represent pixel values, for example, C0, C1, ..., C6 are used to represent different pixel values.
  • Table 1 shows the palette determined by the CU shown in Fig. 1.
  • the index copy information generated according to the palette may be as shown in Table 2 below.
  • Table 2 shows the index run information of the CU shown in Fig. 1 which is formed based on the palette of Table 1.
  • bit stream encoding may be performed. For example, for Left (0, 31), pixel index 0, copy type Left (for example, represented by 0), and copy value 31 may be encoded; (3) The copy type Above (for example, indicated by 1) and the copy value of 3 can be encoded.
  • palette related information for example, palette entry related
  • palette index bitmap may be sequentially used.
  • Information such as a palette index map, is used for bitstream encoding.
  • the palette index bitmap information first encode the number of index (number of index), and then edit the pixel index (index)
  • the code is encoded interleaved with a run type and a run value, and then pixels in a non-palette mode (e.g., escape mode) can be encoded.
  • a non-palette mode e.g., escape mode
  • all pixel indexes need to be indexed (for example, for the information shown in Table 2, 11 pixel indexes need to be "0", “2", “3”, “1", “ 2", “1”, “4", “5", “6", “1”, “2”) perform bitstream encoding, and currently the number of pixel indexes that need to be encoded (for example, 11 shown in Table 2)
  • the bitstream encoding can be explicitly performed (such as shown in Figure 2) or implicitly derived from other information, thereby eliminating the need for bitstream encoding of all pixel indices.
  • FIG. 3 is a schematic flowchart of a method for encoding a pixel index according to an embodiment of the present invention. As shown in FIG. 3, the encoding method includes:
  • Step 301 determining a color palette corresponding to an image area to be encoded
  • Step 302 Determine, according to the palette, a plurality of pixel indexes that need to be encoded in the image area to be encoded;
  • Step 303 Perform bitstream encoding on the plurality of pixel indexes; wherein the last pixel index is not bitstream encoded if the last pixel index first appears.
  • the image area to be encoded may be a coding unit CU or a maximum coding unit LCU (Largest Coding Unit); the following uses CU as an example for description.
  • LCU Large Coding Unit
  • the embodiment of the present invention is applicable to the case of adopting the palette mode, and the embodiment of the present invention is equally applicable to the case of mixing the palette mode and the non-palette mode (for example, the ease mode).
  • bit stream encoding of the palette, the copy type (run_type), the copy value, and the like in the image region to be encoded may be implemented by any one of the prior art, and the present invention does not limit the present invention. . How to encode the pixel index is schematically illustrated below.
  • the CU shown in FIG. 1 is taken as an example for description. As shown above, among the 11 pixel indexes that need to be encoded, the last pixel index is "2", and the pixel index has already appeared before, so the 11 pixel index needs to be encoded.
  • the CU shown in FIG. 4 is taken as an example for description.
  • 4 is a schematic diagram of another example of a coding unit according to an embodiment of the present invention, showing a case of another CU.
  • the palette corresponding to the CU is still as shown in Table 1.
  • Table 3 shows the index run information of the CU shown in FIG. 4 formed based on the palette of Table 1.
  • the decoder can obtain the number of encoded pixel indexes (for example, "9” above) explicitly or implicitly, and further obtain the above-mentioned encoded pixel index (for example, the first 8 pixels) from the bit stream.
  • the last pixel index can be determined (for example from "9” and " 8" These two numbers can be determined to be the last pixel index) have not yet appeared (for example, from the palette information can determine the pixel index is 0 to 6), then the last pixel index can be directly determined based on the known pixel index (for example) It is "6").
  • the number of the plurality of pixel indexes is n, and before the bitstream encoding the plurality of pixel indexes, the encoding method further includes: counting the number of the plurality of pixel indexes Perform bitstream encoding.
  • the performing bitstream coding on the plurality of pixel indexes may include: performing bitstream encoding on the first n-1 pixel indexes; and, in the case that the last pixel index has occurred, the last pixel The index performs bitstream encoding.
  • Table 4 schematically shows the pseudo code of the present embodiment. As shown in Table 4,
  • the number of the plurality of pixel indexes is n
  • the encoding method further includes: counting the number of the plurality of pixels n performs bitstream encoding.
  • the performing bitstream encoding on the multiple pixel indexes may include: for a certain pixel index in the n pixel indexes, where the certain pixel index is not the last pixel index or the certain pixel index has been In the case where it has occurred, the pixel index is bitstream encoded.
  • encoding can be performed in the following order: num_palette_indices_idc (ie, multiple The number of pixel indexes n), then run type and run value information, and then palette_index_idc (that is, the pixel index that needs to be encoded).
  • Table 5 schematically shows the pseudo code of the present embodiment. As shown in Table 5,
  • the encoding method further includes: performing bitstream encoding on n-1; and indicating that the last pixel index is encoded The information is bitstream encoded.
  • num_palette_indices_idc_minus_1 may be used to indicate n-1, and further, last_palette_indices_present_flag may be used to indicate whether the last pixel index is encoded.
  • the number of pixel indexes that need to be encoded, NumPaletteIndices, and the above two identifiers satisfy, for example, the following relationship:
  • Table 6 schematically shows the pseudo code of the present embodiment. As shown in Table 6,
  • Tables 4 to 6 only show some embodiments of the embodiments of the present invention, but the embodiments of the present invention are not limited thereto, and may be adjusted or changed according to actual conditions, and may be determined according to actual scenarios. Implementation.
  • the plurality of pixel indexes that need to be encoded in the image region to be encoded are bitstream encoded, wherein the last pixel index is not bitstream encoded if the last pixel index first appears.
  • the embodiment of the present invention provides an encoding apparatus for a pixel index, which corresponds to the encoding method of the pixel index in Embodiment 1, and the same content is not described herein again.
  • FIG. 5 is a schematic diagram of an apparatus for encoding a pixel index according to an embodiment of the present invention. As shown in FIG. 5, the encoding apparatus 500 includes:
  • a palette determining unit 501 determining a palette corresponding to an image region to be encoded
  • a pixel index determining unit 502 based on the palette, determining a plurality of pixel indexes that the image area to be encoded needs to be encoded;
  • the bitstream encoding unit 503 performs bitstream encoding on the plurality of pixel indexes; wherein the last pixel index is not bitstream encoded if the last pixel index first appears.
  • the bitstream encoding unit 503 is further configured to perform bitstream encoding on the number n of the plurality of pixel indexes.
  • the bitstream encoding unit 503 is specifically configured to: use the first n-1 pixels to The bitstream encoding is performed; and in the case where the last pixel index has occurred, the last pixel index is bitstream encoded.
  • bitstream encoding unit 503 is further configured to perform bitstream encoding on the number n of the plurality of pixel indexes.
  • the bitstream encoding unit 503 is specifically configured to: for a certain pixel index in the n pixel indexes, where the certain pixel index is not the last pixel index or the certain pixel index has appeared In the case, the one pixel index is bitstream encoded.
  • bitstream encoding unit 503 is specifically configured to: perform bitstream encoding on n-1, the number of the plurality of pixel indexes is n; and indicate whether the last pixel index is performed.
  • the encoded indication information is subjected to bit stream coding.
  • the plurality of pixel indexes that need to be encoded in the image region to be encoded are bitstream encoded, wherein the last pixel index is not bitstream encoded if the last pixel index first appears.
  • An embodiment of the present invention provides a method for decoding a pixel index, which corresponds to the encoding method of the pixel index in Embodiment 1.
  • the embodiment of the present invention performs decoding accordingly, and the same content is not described again.
  • any one of the related methods may be employed, and the present invention is not limited thereto.
  • FIG. 6 is a schematic diagram of a method for decoding a pixel index according to an embodiment of the present invention. As shown in FIG. 6, the decoding method includes:
  • Step 601 Determine a color palette of an image area to be decoded and a number of pixel indexes that need to be decoded;
  • Step 602 Determine, according to the color palette and the number of the pixel indexes, whether the last pixel index first appears;
  • Step 602 in the case that the last pixel index first appears, obtain the last pixel index based on a known pixel index; and obtain the current bit index from the bit stream if the last pixel index is not first.
  • the last pixel index in the case that the last pixel index first appears, obtain the last pixel index based on a known pixel index; and obtain the current bit index from the bit stream if the last pixel index is not first. The last pixel index.
  • FIG. 7 is another schematic diagram of a method for decoding a pixel index according to an embodiment of the present invention. As shown in FIG. 7, the decoding method includes:
  • Step 701 determining a color palette of an image area to be decoded
  • Step 702 determining the number of pixel indexes that need to be decoded
  • the information of the palette may be obtained by decoding the bit stream; the number of pixel indexes that need to be decoded may be explicitly obtained from decoding the bit stream, or may be derived from other information. Obtained.
  • Step 703 Determine, according to the number of the pixel index and the number of decoded pixel indexes, whether the current pixel index is the last pixel index; if not, perform step 704, and execute the step if it is the last pixel index. 705.
  • Step 704 Obtain the pixel index from a bitstream.
  • step 703 may be continued to obtain the next pixel index.
  • Step 705 it is determined whether the last pixel index has occurred; in the case of occurrence, step 706 is performed, if not, step 707 is performed;
  • Step 706 Obtain the last pixel index from the bitstream.
  • Step 707 Obtain the last pixel index based on a known pixel index.
  • FIG. 6 and FIG. 7 only show some embodiments of the embodiments of the present invention, but the present invention is not limited thereto, and may also correspond to the encoding methods shown in Tables 4 to 6, for example.
  • the method of image decoding is not limited thereto, and may also correspond to the encoding methods shown in Tables 4 to 6, for example. The method of image decoding.
  • the plurality of pixel indexes that need to be encoded in the image region to be encoded are bitstream encoded, wherein the last pixel index is not bitstream encoded if the last pixel index first appears.
  • the embodiment of the present invention provides a decoding apparatus for a pixel index, which corresponds to the decoding method of the pixel index in Embodiment 3, and the same content is not described herein again.
  • FIG. 8 is a schematic diagram of a pixel index decoding apparatus according to an embodiment of the present invention. As shown in FIG. 8, the image decoding apparatus 800 includes:
  • the information determining unit 801 determines a palette of the image area to be decoded and a number of pixel indexes that need to be decoded;
  • the index determining unit 802 determines whether the last pixel index first appears according to the color palette and the number of the pixel indexes;
  • the index obtaining unit 803 obtains the last pixel index based on a known pixel index in the case where the last pixel index first appears; in the case of the last pixel index not first appearing, from the bit stream Obtain the last pixel index.
  • the plurality of pixel indexes that need to be encoded in the image region to be encoded are bitstream encoded, wherein the last pixel index is not bitstream encoded if the last pixel index first appears.
  • An embodiment of the present invention provides an image processing apparatus, including: the encoding apparatus according to Embodiment 2 and/or the decoding apparatus as described in Embodiment 4.
  • FIG. 9 is a block diagram showing the configuration of an image processing apparatus according to an embodiment of the present invention.
  • the image processing apparatus 900 may include a central processing unit (CPU) 100 and a memory 110; the memory 110 is coupled to the central processing unit 100.
  • the memory 110 can store various data; in addition, a program for information processing is stored, and the program is executed under the control of the central processing unit 100.
  • the functionality of encoding device 500 may be integrated into central processor 100.
  • the central processing unit 100 can be configured to implement the encoding method as described in Embodiment 1.
  • the functionality of the decoding device 800 can also be integrated into the central processor 100.
  • the central processing unit 100 can be configured to implement the decoding method as described in Embodiment 3.
  • the encoding device 500 and/or the decoding device 800 can be configured separately from the central processing unit.
  • the encoding device 500 and/or the decoding device 800 can be configured as a chip connected to the central processing unit 100 through central processing. The control of the device implements the functions of the encoding device 500 and/or the decoding device 800.
  • the image processing apparatus 900 may further include: an input and output unit 120, a display unit 130, and the like; wherein the functions of the above components are similar to those of the prior art, and details are not described herein again. It is to be noted that the image processing apparatus 900 does not necessarily have to include all of the components shown in FIG. 9; in addition, the image processing apparatus 900 may further include components not shown in FIG. 9, and reference may be made to the related art.
  • Embodiments of the present invention also provide a computer readable program, wherein when the process is performed in an image processing device In the sequence, the program causes the computer to execute the encoding method as described in Embodiment 1 and/or the decoding method as described in Embodiment 3 in the image processing apparatus.
  • An embodiment of the present invention further provides a storage medium storing a computer readable program, wherein the computer readable program causes a computer to execute the encoding method as described in Embodiment 1 in an image processing apparatus and/or as in Embodiment 3 The decoding method described.
  • the above apparatus and method of the present invention may be implemented by hardware or by hardware in combination with software.
  • the present invention relates to a computer readable program that, when executed by a logic component, enables the logic component to implement the apparatus or components described above, or to cause the logic component to implement the various methods described above Or steps.
  • the present invention also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, or the like.
  • One or more of the functional blocks described in the figures and/or one or more combinations of functional blocks may be implemented as a general purpose processor, digital signal processor (DSP) for performing the functions described herein.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • One or more of the functional blocks described with respect to the figures and/or one or more combinations of functional blocks may also be implemented as a combination of computing devices, eg, a combination of a DSP and a microprocessor, multiple microprocessors One or more microprocessors in conjunction with DSP communication or any other such configuration.

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Abstract

L'invention concerne un procédé et un appareil d'encodage d'indice de pixel, et un dispositif de traitement d'image. Le procédé d'encodage comprend les étapes consistant à : déterminer une palette correspondant à une région d'image à encoder ; sur la base de la palette, déterminer une pluralité d'indices de pixel devant être encodés dans la région d'image à encoder ; et exécuter un encodage de flux binaire sur la pluralité d'indices de pixel, l'encodage de flux binaire n'étant pas exécuté sur le dernier indice de pixels lorsque le dernier indice de pixel apparaît pour la première fois. En supprimant la nécessité d'encoder tous les indices de pixel dans des informations de copie, l'invention permet de réduire les coûts binaires d'encodage.
PCT/CN2015/081032 2015-06-09 2015-06-09 Procédé et appareil d'encodage d'indice de pixel, et dispositif de traitement d'image Ceased WO2016197312A1 (fr)

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Citations (3)

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Publication number Priority date Publication date Assignee Title
US20090161973A1 (en) * 2007-12-19 2009-06-25 Canon Kabushiki Kaisha Variable-Length Encoding for Image Data Compression
WO2014165784A1 (fr) * 2013-04-05 2014-10-09 Qualcomm Incorporated Détermination d'indices de palette dans un codage vidéo basé sur une palette
WO2015006169A1 (fr) * 2013-07-08 2015-01-15 Sony Corporation Amélioration pour un mode de codage de palette

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
US20090161973A1 (en) * 2007-12-19 2009-06-25 Canon Kabushiki Kaisha Variable-Length Encoding for Image Data Compression
WO2014165784A1 (fr) * 2013-04-05 2014-10-09 Qualcomm Incorporated Détermination d'indices de palette dans un codage vidéo basé sur une palette
WO2015006169A1 (fr) * 2013-07-08 2015-01-15 Sony Corporation Amélioration pour un mode de codage de palette

Non-Patent Citations (2)

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Title
FENG, ZHOU. ET AL.: "Non-RCE4: Joint proposal of JCTVC-P0231 and JCTVC-P0119: Palette with Limited Run and Lasted Coded Palette Prediction", JOINT COLLABORATIVE TEAM ON VIDEO CODING (JCT-VC) OF ITU-T SG 16 WP 3 AND ISO/IEC JTC 1/SC 29/WG 11, 16TH MEETING, 17 January 2014 (2014-01-17), San Jose, US *
XUN, GUO. ET AL.: "RCE4: Summary report of HEVC Range Extensions Core Experiments 4 (RCE4) on Palette Coding for Screen Content", JOINT COLLABORATIVE TEAM ON VIDEO CODING (JCT-VC) OF ITU-T SG 16 WP 3 AND ISO/IEC JTC 1/SC 29/WG 11, 16TH MEETING, 17 January 2014 (2014-01-17), San Jose, US *

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